Slovenia announces TLS certificate replacement for Fiscal Cash Register System on November 12, 2026

Slovenia's Tax Authority (FURS) will replace the TLS digital certificate used by its production fiscal cash register system on November 12, 2026. POS providers should test their connections using the temporary production environment to prevent fiscal verification disruptions.

Slovenia's Financial Administration (FURS) announced on October 23, 2026, that it will replace the digital certificate used to establish secure TLS connections in its production fiscal cash register system. The replacement is scheduled for November 12, 2026, between 22:00 and 24:00, affecting the production endpoint blagajne.fu.gov.si:9003.

The change is part of the technical maintenance of Slovenia's fiscal verification infrastructure. Although it does not introduce new fiscalization obligations, it is important for retailers, POS software providers and fiscal system integrators because their software must continue communicating securely with FURS after the certificate replacement.

To support preparations, FURS has published the new certificate and established a temporary parallel production environment where developers can test their systems before the scheduled change.

The official announcement and technical instructions are available through the FURS developer portal.

https://www.fu.gov.si/odis_fu_obvestila_o_delovanju_informacijskih_sistemov_furs/davcne_blagajne_obvestila_o_delovanju_informacijskih_sistemov_furs_odis_fu/#newsList292646

https://edavki.durs.si/EdavkiPortal/OpenPortal/CommonPages/Opdynp/PageD.aspx?category=dpr_teh_spec

The upcoming update concerns the digital certificate used to establish a Transport Layer Security (TLS) connection between fiscal cash register software and the Tax Authority's production system. TLS is the security technology that protects information exchanged between POS systems and FURS. It helps ensure that communication takes place through an encrypted and authenticated connection. When a retailer issues a fiscal receipt, the fiscal software communicates with the FURS system to submit the required transaction data and obtain fiscal verification. The digital certificate allows the software to verify the identity of the FURS server before establishing a secure connection.

For most correctly configured software solutions, the change should require little or no intervention. However, systems that depend on a specific certificate, use outdated trust stores or have restrictive certificate-validation settings may experience connection problems.

To help businesses prepare, FURS has established a temporary parallel production environment using the new TLS certificate.

FURS has confirmed that the temporary parallel production environment will be removed after November 25, 2026. This gives software providers an opportunity to verify compatibility before the certificate replacement and perform additional checks after implementation. The new certificate is already published in the Digitalna potrdila (Digital Certificates) section of the official developer portal.

POS providers should use the available testing period to identify potential connection issues before they affect normal retail operations.

Implementation Impact and What Businesses Should Do

The certificate replacement primarily affects POS software providers, fiscal solution developers, system integrators and retailers operating electronic fiscal cash registers in Slovenia.

Businesses should take the following actions:

1. Download the new TLS certificate from the official FURS developer portal.

2. Test POS connectivity using the temporary production environment on port 9009 before November 12, 2026.

3. Verify certificate compatibility, including trust stores, certificate validation, and TLS configurations.

4. Coordinate with software providers to ensure that all affected POS installations will continue functioning after the update.

5. Monitor fiscal verification operations following the replacement and complete any additional checks before the temporary environment is removed after November 25, 2026.

The update does not require retailers to change their fiscal receipt format or reporting procedures. Its main purpose is to maintain secure communication with the Tax Authority.

The key priority is to ensure that POS systems can continue submitting fiscal verification requests without interruption after November 12, 2026.

Here is the official source

Nikolina Basić, Senior Legal Consultant at Fiscal Solutions

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